I found a company called Vanguard Arms that makes and sales a Kit to make the Chicopee Rifle that looks very nice and simpler to build.
As a separate part from the kit they offer a trunnion for the barre that I think that it would make it easier to thread.
If you have had experience with Vanguard Arms please let me know what you think of them and their products and service.
Thanks,
Terryt